Connecting a Hayes modem

ccfSGID: 500:812/08.44 278a4040 Good health, Ivan! Thursday 04 Jan 2001 15:42:00 Ivan Bogomolov -> All: IB> People! Please send me a diagram without using IB> NMI for Pentagon128 ========================== HAYES .M ========================================= ─ SPECTRUM RULEZ! ZX.SPECTRUM ─ Msg: 156 of 185 From : Alexei Bugai 2:461/173.3 Fri 31 Oct 97 23:19 To : All Mon 03 Nov 97 17:43 Subj: Connection diagram HAYES! ─────────────────── ──────────────────── ──────────────────── ──────────────────── ─ Peace unto you, _All_! Connection diagram for internal HAYES modem. (provided with changes) Copyright G.Shepelev slot pins: ┌─────────┐ ┌─────────┬─────────┐ │DATA 0-7 ├──────────────────────── A9-A2 0-7 │ ├─────────┤ └─────────┴─────────┘ │ A15 ├──┐ ┌───┐ 555LL1 └─────────┘ └─┤ 1 ├─┐ ┌───┐ ┌─────────┬─────────┐ A22,A23 │ A9,A8 │ │ A14 ├──┘ └───┘ ┌─┤ O─┼─┐ ├─────────┼─────────┤ ├─────────┤ │ └───┘ │ └────────┤ A24,A25 │ A7,A6 │ │ A13,A12 ├──────────┼───────┘ 10k ├─────────┼─────────┤└─────────┘ │ +5v<──════──┤ A26,A27 │ A5,A4 │ ┌─────────┐ │ ├─────────┼─────────┤ A28-A31 A28-A31 A3-A0 │ ├─────────┤ │ ├─────────┼─────────┤ │ A6 ├──────────┘ 555ЛЕ1 ├──┤ A11 │ AEN │ ├─────────┤ ├─┐┌───┐ ├─────────┼─────────┤ │ ___ │ └┤ 1 O───────────────┤ B2 │ RES DRV │ │ RES ├─────────┤ │ ├─────────┼─────────┤ ├─────────┤ └───┘ │ │ ___ │ │ __ │ ┌────────┤ B13 │ IOW │ │ WR ├───────┐ ┌───┐ │ └─────────┴─────────┘ ├─────────┤ └─┤ 1 ├──────┘ │ __ │ ┌─┤ │ ┌─────────┬─────────┐ │ RD ├───┐ │ └───┘ ┌────────┤ │ ___ │ ├─────────┤ │ │ ┌───┐ │ │ B14 │ IOR │ │ ____ │ └───┼─┤ 1 ├──────┘ ├─────────┼─────────┤ │ OIRQ ├───────╧─┤ │ ├─┤B1,10,31 │ GND │ └─────────┘ └───┘ └─────────┴─────────┘ Разводка адресной шины с A0-A15. I can use it from A6 to A1 or A1. OIRQ #38FD-#3FFD, they can be replaced with 48F. How to use the following steps: #38BF-#3FBF.For many modems, 5v power is sufficient, but some may voltages of other ratings are required: -5v B5 -12v B7 +5v B3,B29 +12v B9 And you can find out which of them are necessary by looking to the modem connector. P.S. Attention! There was a mistake in ZxNews! With best wishes, [ZX_Power Team] Dr. Squizer. [Power_ZX Team] -+- Powered by Spectrum Mail System. + Origin: X-Project BBS (2:461/173.3) =================================================================================== Bye.